/// <summary>
/// Render this object to the specified <see c_ref="Graphics"/> device.
/// </summary>
/// <remarks>
/// This method is normally only called by the Draw method
/// of the parent <see c_ref="GraphObjList"/> collection object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see c_ref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see c_ref="GraphPane"/> object using the
/// <see c_ref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
override public void Draw(Graphics g, PaneBase pane, float scaleFactor)
{
// Convert the arrow coordinates from the user coordinate system
// to the screen coordinate system
PointF pix1 = Location.TransformTopLeft(pane);
PointF pix2 = Location.TransformBottomRight(pane);
if (pix1.X > -10000 && pix1.X < 100000 && pix1.Y > -100000 && pix1.Y < 100000 &&
pix2.X > -10000 && pix2.X < 100000 && pix2.Y > -100000 && pix2.Y < 100000)
{
// calculate the length and the angle of the arrow "vector"
double dy = pix2.Y - pix1.Y;
double dx = pix2.X - pix1.X;
float angle = (float)Math.Atan2(dy, dx) * 180.0F / (float)Math.PI;
float length = (float)Math.Sqrt(dx * dx + dy * dy);
// Save the old transform matrix
Matrix transform = g.Transform;
// Move the coordinate system so it is located at the starting point
// of this arrow
g.TranslateTransform(pix1.X, pix1.Y);
// Rotate the coordinate system according to the angle of this arrow
// about the starting point
g.RotateTransform(angle);
// get a pen according to this arrow properties
using (Pen pen = _line.GetPen(pane, scaleFactor))
//new Pen( _line._color, pane.ScaledPenWidth( _line._width, scaleFactor ) ) )
{
//pen.DashStyle = _style;
g.DrawLine(pen, 0, 0, length, 0);
}
// Restore the transform matrix back to its original state
g.Transform = transform;
}
}
/// <summary>
/// Calculate the <see c_ref="Legend"/> rectangle (<see c_ref="Rect"/>),
/// taking into account the number of required legend
/// entries, and the legend drawing preferences.
/// </summary>
/// <remarks>Adjust the size of the
/// <see c_ref="Chart.Rect"/> for the parent <see c_ref="GraphPane"/> to accomodate the
/// space required by the legend.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see c_ref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see c_ref="GraphPane"/> object using the
/// <see c_ref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
/// <param name="tChartRect">
/// The rectangle that contains the area bounded by the axes, in pixel units.
/// <seealso c_ref="Chart.Rect" />
/// </param>
public void CalcRect(Graphics g, PaneBase pane, float scaleFactor,
ref RectangleF tChartRect)
{
// Start with an empty rectangle
_rect = Rectangle.Empty;
_hStack = 1;
_legendItemWidth = 1;
_legendItemHeight = 0;
RectangleF clientRect = pane.CalcClientRect(g, scaleFactor);
// If the legend is invisible, don't do anything
if (!_isVisible)
{
return;
}
int nCurve = 0;
PaneList paneList = GetPaneList(pane);
_tmpSize = GetMaxHeight(paneList, g, scaleFactor);
float halfGap = _tmpSize / 2.0F,
maxWidth = 0,
tmpWidth,
gapPix = _gap * _tmpSize;
foreach (GraphPane tmpPane in paneList)
{
// Loop through each curve in the curve list
// Find the maximum width of the legend labels
//foreach ( CurveItem curve in tmpPane.CurveList )
//foreach ( CurveItem curve in GetIterator( tmpPane.CurveList, _isReverse ) )
int count = tmpPane.CurveList.Count;
for (int i = 0; i < count; i++)
{
CurveItem curve = tmpPane.CurveList[_isReverse ? count - i - 1 : i];
if (curve._label._text != string.Empty && curve._label._isVisible)
{
// Calculate the width of the label save the max width
FontSpec tmpFont = (curve._label._fontSpec != null) ?
curve._label._fontSpec : FontSpec;
tmpWidth = tmpFont.GetWidth(g, curve._label._text, scaleFactor);
if (tmpWidth > maxWidth)
{
maxWidth = tmpWidth;
}
// Save the maximum symbol height for line-type curves
if (curve is LineItem && ((LineItem)curve).Symbol.Size > _legendItemHeight)
{
_legendItemHeight = ((LineItem)curve).Symbol.Size;
}
nCurve++;
}
}
if (pane is MasterPane && ((MasterPane)pane).IsUniformLegendEntries)
{
break;
}
}
float widthAvail;
// Is this legend horizontally stacked?
if (_isHStack)
{
// Determine the available space for horizontal stacking
switch (_position)
{
// Never stack if the legend is to the right or left
case LegendPos.Right:
case LegendPos.Left:
widthAvail = 0;
break;
// for the top & bottom, the axis border width is available
case LegendPos.Top:
case LegendPos.TopCenter:
case LegendPos.Bottom:
case LegendPos.BottomCenter:
widthAvail = tChartRect.Width;
break;
// for the top & bottom flush left, the panerect less margins is available
case LegendPos.TopFlushLeft:
case LegendPos.BottomFlushLeft:
widthAvail = clientRect.Width;
break;
// for inside the axis area or Float, use 1/2 of the axis border width
case LegendPos.InsideTopRight:
case LegendPos.InsideTopLeft:
case LegendPos.InsideBotRight:
case LegendPos.InsideBotLeft:
case LegendPos.Float:
widthAvail = tChartRect.Width / 2;
break;
// shouldn't ever happen
default:
widthAvail = 0;
break;
}
// width of one legend entry
if (_isShowLegendSymbols)
{
_legendItemWidth = 3.0f * _tmpSize + maxWidth;
}
else
{
_legendItemWidth = 0.5f * _tmpSize + maxWidth;
}
// Calculate the number of columns in the legend
// Normally, the legend is:
// available width / ( max width of any entry + space for line&symbol )
if (maxWidth > 0)
{
_hStack = (int)((widthAvail - halfGap) / _legendItemWidth);
}
// You can never have more columns than legend entries
if (_hStack > nCurve)
{
_hStack = nCurve;
}
// a saftey check
if (_hStack == 0)
{
_hStack = 1;
}
}
else
{
if (_isShowLegendSymbols)
{
_legendItemWidth = 3.0F * _tmpSize + maxWidth;
}
else
{
_legendItemWidth = 0.5F * _tmpSize + maxWidth;
}
}
// legend is:
// item: space line space text space
// width: wid 4*wid wid maxWid wid
// The symbol is centered on the line
//
// legend begins 3 * wid to the right of the plot rect
//
// The height of the legend is the actual height of the lines of text
// (nCurve * hite) plus wid on top and wid on the bottom
// total legend width
float totLegWidth = _hStack * _legendItemWidth;
// The total legend height
_legendItemHeight = _legendItemHeight * scaleFactor + halfGap;
if (_tmpSize > _legendItemHeight)
{
_legendItemHeight = _tmpSize;
}
float totLegHeight = (float)Math.Ceiling(nCurve / (double)_hStack)
* _legendItemHeight;
RectangleF newRect = new RectangleF();
// Now calculate the legend rect based on the above determined parameters
// Also, adjust the ChartRect to reflect the space for the legend
if (nCurve > 0)
{
newRect = new RectangleF(0, 0, totLegWidth, totLegHeight);
// The switch statement assigns the left and top edges, and adjusts the ChartRect
// as required. The right and bottom edges are calculated at the bottom of the switch.
switch (_position)
{
case LegendPos.Right:
newRect.X = clientRect.Right - totLegWidth;
newRect.Y = tChartRect.Top;
tChartRect.Width -= totLegWidth + gapPix;
break;
case LegendPos.Top:
newRect.X = tChartRect.Left;
newRect.Y = clientRect.Top;
tChartRect.Y += totLegHeight + gapPix;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.TopFlushLeft:
newRect.X = clientRect.Left;
newRect.Y = clientRect.Top;
tChartRect.Y += totLegHeight + gapPix * 1.5f;
tChartRect.Height -= totLegHeight + gapPix * 1.5f;
break;
case LegendPos.TopCenter:
newRect.X = tChartRect.Left + (tChartRect.Width - totLegWidth) / 2;
newRect.Y = tChartRect.Top;
tChartRect.Y += totLegHeight + gapPix;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.Bottom:
newRect.X = tChartRect.Left;
newRect.Y = clientRect.Bottom - totLegHeight;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.BottomFlushLeft:
newRect.X = clientRect.Left;
newRect.Y = clientRect.Bottom - totLegHeight;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.BottomCenter:
newRect.X = tChartRect.Left + (tChartRect.Width - totLegWidth) / 2;
newRect.Y = clientRect.Bottom - totLegHeight;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.Left:
newRect.X = clientRect.Left;
newRect.Y = tChartRect.Top;
tChartRect.X += totLegWidth + halfGap;
tChartRect.Width -= totLegWidth + gapPix;
break;
case LegendPos.InsideTopRight:
newRect.X = tChartRect.Right - totLegWidth;
newRect.Y = tChartRect.Top;
break;
case LegendPos.InsideTopLeft:
newRect.X = tChartRect.Left;
newRect.Y = tChartRect.Top;
break;
case LegendPos.InsideBotRight:
newRect.X = tChartRect.Right - totLegWidth;
newRect.Y = tChartRect.Bottom - totLegHeight;
break;
case LegendPos.InsideBotLeft:
newRect.X = tChartRect.Left;
newRect.Y = tChartRect.Bottom - totLegHeight;
break;
case LegendPos.Float:
newRect.Location = Location.TransformTopLeft(pane, totLegWidth, totLegHeight);
break;
}
}
_rect = newRect;
}
/// <summary>
/// Render this object to the specified <see c_ref="Graphics"/> device.
/// </summary>
/// <remarks>
/// This method is normally only called by the Draw method
/// of the parent <see c_ref="GraphObjList"/> collection object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see c_ref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see c_ref="GraphPane"/> object using the
/// <see c_ref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
public override void Draw( Graphics g, PaneBase pane, float scaleFactor )
{
// Convert the arrow coordinates from the user coordinate system
// to the screen coordinate system
PointF pix1 = Location.TransformTopLeft( pane );
PointF pix2 = Location.TransformBottomRight( pane );
if ( pix1.X > -10000 && pix1.X < 100000 && pix1.Y > -100000 && pix1.Y < 100000 &&
pix2.X > -10000 && pix2.X < 100000 && pix2.Y > -100000 && pix2.Y < 100000 )
{
// get a scaled size for the arrowhead
float scaledSize = _size * scaleFactor;
// calculate the length and the angle of the arrow "vector"
double dy = pix2.Y - pix1.Y;
double dx = pix2.X - pix1.X;
float angle = (float)Math.Atan2( dy, dx ) * 180.0F / (float)Math.PI;
float length = (float)Math.Sqrt( dx * dx + dy * dy );
// Save the old transform matrix
Matrix transform = g.Transform;
// Move the coordinate system so it is located at the starting point
// of this arrow
g.TranslateTransform( pix1.X, pix1.Y );
// Rotate the coordinate system according to the angle of this arrow
// about the starting point
g.RotateTransform( angle );
// get a pen according to this arrow properties
using ( Pen pen = _line.GetPen( pane, scaleFactor ) )
//new Pen( _color, pane.ScaledPenWidth( _penWidth, scaleFactor ) ) )
{
//pen.DashStyle = _style;
// Only show the arrowhead if required
if ( _isArrowHead )
{
// Draw the line segment for this arrow
g.DrawLine( pen, 0, 0, length - scaledSize + 1, 0 );
// Create a polygon representing the arrowhead based on the scaled
// size
PointF[] polyPt = new PointF[4];
float hsize = scaledSize / 3.0F;
polyPt[0].X = length;
polyPt[0].Y = 0;
polyPt[1].X = length - scaledSize;
polyPt[1].Y = hsize;
polyPt[2].X = length - scaledSize;
polyPt[2].Y = -hsize;
polyPt[3] = polyPt[0];
using ( SolidBrush brush = new SolidBrush( _line._color ) )
// render the arrowhead
g.FillPolygon( brush, polyPt );
}
else
g.DrawLine( pen, 0, 0, length, 0 );
}
// Restore the transform matrix back to its original state
g.Transform = transform;
}
}